Improvement in stave-maghihes



WILLIAM S. COLWELL, GF PITTSBURG, ASSIGNOR TO JAhLlES M. HEMP- HlLL, OFALLEGHENY ClTY, PENNSYLVANIA. Letters Patent- No. 7 3,505, dated January21, 1 868,

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, WILLIAM S. COLWELL, of Pittsburg, in the county ofAllegheny,.nnd State of Pennsylrnnia, have invented a new and usefulImprovement in Cuttin'gJ-Iead for Stovehlzrchine; and I do herobydeclare that the following-is a. full, clear, and exact descriptionthereof, refoi once being had to the accompanying drawings, and to theletters of reference mnrked thereon. i

The nature of my invention consists in pivoting the cutting'head of sstove-machine, so that the point of pivot shell boon a. plane with thecutting-edges of the knives, said cutt ng-head, \vithits pivot andknives,being constructed, arranged, andopcrating in the mannerhereinafter described.

To enable others "skilled in the art to make and use my invention, Iwill proceed to describe itsconstruction and operation, In theaccompanying drawings, which form part of my specification- Figure 1represents a. front elevation of my improvement in cutting heads forstove-machines.

Figure 2 is a. section of the some out through the line 2:.

Figure 3 is oi top view of my improved cutting-head for stove-machines.

Figure 4'is e. top view of the hollow wedge used for holding the knivesin a fixed position.

The heads, which consist of the bottom piece A, top piece A, and sidepicces A and A, are provided with a. pivot, k,-wi.iich is fitted to anopening in the base-plste, marked B. On the buck pnrt of the plate Aofthe cutting-head is a pin, 2', which is fitted in between the threadsof the endless screw J, which is placed in a recess marked S, in thebascplate The bottom plotc'A and the top plate A are provided withrecesses, O, which serve as guides for the hollow wcdge, which consistsof side picce's 12, bottom piece g, and top piece g. (The form of thepieces g and g is shown in fig. 4, sheet B.) The cutting-knives are ofthe form of a section of a. tube or hollow cylinder; (the concave {aceof the knives face t'ho work.) The cutting-edge of the knife 0 is madeconcave, and the cutting edge of the knife D is made convex. The mannerof constructing the knives is clearly set forth in on application forLetters Patent which accompany this application. The ends of theknives Cand 1) are fitted to grooves or recesses made in the plates A and A ofthe cutting-head. The knives are adjusted and held in the desiredposition by means of the sct-scrcws c and the hollow wedge, which isheld in its proper position by the set-screw marked f. The back port ofthe cutting-head is held down by means of the piece m.

The operation of my improved cultinghcud is as follows: Having adjustedthe knives C and D, so that the desired space, 1', between the kniveswill correspond to the thickness of the stove desired, the uniormed andunshnvcd' stave is forced against the cutting-edges of'the knives in theusual manner, and by any known means. The cutting-edges of the knivcsare made to follow the desired line of the plane of the sta-vc byturning the cutting-head onits pivot 7:, by means of the lever ll, screwJ, and pin By pivoting the cutting-heed in the manner described, andmoving the back part of it in the manner and by the means set forth, thecutting-edges of'the knives are, with ease and certainty, controlled by,the operator.

Having thus described the nature, construction, and operation ofmy'improvcment, what I claim as of my invention, is-- I i The hollowwedge, constructed as herein described, and used in connection with theknives C and D and set-screws f and e, in the manner and for the purposeherein'set'fortb. I l

w. s. COLWELL.

Witnesses:

JAMES J. Jeuxsrozv, A. B. GATE.-

